patch 8.2.5110: icon filetype not recognized from the first line

Problem:    Icon filetype not recognized from the first line.
Solution:   Add a check for the first line. (Doug Kearns)

runtime/autoload/dist/script.vim

@@ -189,6 +189,10 @@ def DetectFromHashBang(firstline: string)
   elseif name =~ 'gforth\>'
     set ft=forth
 
+    # Icon
+  elseif name =~ 'icon\>'
+    set ft=icon
+
   endif
 enddef
 

src/testdir/test_filetype.vim

@@ -718,6 +718,7 @@ let s:script_checks = {
       \ 'routeros': [['#!/path/rsc']],
       \ 'fish': [['#!/path/fish']],
       \ 'forth': [['#!/path/gforth']],
+      \ 'icon': [['#!/path/icon']],
       \ }
 
 " Various forms of "env" optional arguments.

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    5110,
 /**/
     5109,
 /**/